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Finding the Fourth Proportional to 754.44, 1,131.09 and 389.16

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Solution

The fourth proportional to 754.44, 1,131.09 and 389.16 is: 583.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.44 : 1,131.09 = 389.16 : x
  2. Step 2: Convert to fraction form
    754.44/1,131.09 = 389.16/x
  3. Step 3: Cross multiply
    754.44x = 1,131.09 × 389.16
  4. Step 4: Simplify right side
    754.44x = 440,174.98
  5. Step 5: Solve for x
    x = 440,174.98/754.44
  6. Step 6: Final answer
    x = 583.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.